Showing specs for all NA & NB Miatas

6-speed manual transmission oil type and capacity (2005; Mazdaspeed 2004–2005)

1.9 US qt1.8 L1.8 L1.9 US qt1.6 Imp qtManual transmission gear oil; API Service GL-4 or GL-5; SAE 75W-90 (any temperature); SAE 80W-90 above 10°C (50°F)
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Approximate published quantity. Check the level using the cited manual; do not assume a drain-and-fill amount.

Applies to
  • NB 2005 (BP-Z3, 6MT)
  • NB 2004–2005 (BP-Z3-TURBO, 6MT) — 2004 applicability is inferred from the 2005 owner’s manual; 2004 is not source-year verified.
  • Verified in: 2005 Mazda MX-5 Miata Owner’s Manual
Sources
  • Page 10-5
    1.9 US qt1.8 L1.8 L1.9 US qt1.6 Imp qt
    Printed: “6-Speed transmission L US qt Imp qt 1.8 1.9 1.6”
  • Page 10-4
    Manual transmission gear oil; API Service GL-4 or GL-5; SAE 75W-90 (any temperature); SAE 80W-90 above 10°C (50°F)
    Printed: “Any temperature API Service GL-4 or GL-5 SAE 75W-90 Above 10°C (50°F) API Service GL-4 or GL-5 SAE 80W-90”